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Study on LiFePO4 Material and the High Power Battery

Pages: 213-217

Xiaoyue Wang¹, Borong Wu^*,1,2, Kai Yang^1,2, Xuankun Yang³, Chuan Wu^1,2, Feng Wang¹, Feng Wu^{1, 2}, Shi Chen^1,2, and Gewei Li³

¹School of Chemical Engineering and the environment, Beijing Institute of Technology, Beijing 100081, China
²National Development Center for High Technology Green Material, Beijing 100081, China
³Xianyang Weilike Energy Co., Ltd. Xianyang 712046, China

Received: July 8, 2008, Accepted: February 20, 2009

Abstract:
LiFePO4 has attracted considerable attention as next generation cathode material of lithium ion battery for electric vehicles; however, the cathode material LiFePO4 has poor rate capability attributed attributing to low electronic conductivity and low density. For obtaining high performance of electrode and battery, three types of olivine compounds LiFePO4, which were synthesized by solid-state reaction and supplied by different producers, were evaluated for use in a lithium ion power battery for HEV in this paper. It was founded that pure and well crystallized LiFePO4 materials with small particle sizes, and homogeneous particle size distribution were propitious to prepare the high power battery. After optimizing loading density of the material in its electrode, a high power 8Ah LiFePO4 battery was prepared with the sample material, and the battery could discharge with at a current density of 40C rate current. Its specific power reaches 1700 W/Kg and its specific energy reaches 60 Wh/Kg.

Keywords:
LiFePO4; Lithium ion Battery; Specific power; HEV.